Albert remarked that even when it is turned upside down, the number plate of his car still made sense.

He observed that this would however increase the registration number on it by 8505.

Given, all of the four digits in the number is different, find out what was his car license number?

I wonder if there is a formal logical way of solving this problem? Or is it pretty much a trial and error thing?

Posted by levik on 2003-02-05 11:23:00